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4 Ports 11g Wireless ADSL2/2+ Router 104
4.4.11 ADVANCED - Multicast
Multicasting is a form of limited broadcast. UDP is used to send datagram to all hosts that belong to what is
called a “Host group”. A host group is a set of zero or more hosts identified by the same destination IP
address. The following statements apply to host groups:
„ Anyone can join or leave a host group at will.
„ There are no restrictions on a host’s location.
„ There are no restrictions on the number of members that may belong to a host group.
„ A host may belong to multiple host groups.
„ Non-group members may send UDP datagram to the host group.
Multicasting is useful when data needs to be sent to more than one device. For instance, if one device is
responsible for acquiring data that many other devices need, then multicasting is a natural fit. Note that using
multicasting as opposed to sending the same data to individual devices uses less network bandwidth.
The multicast feature also enables you to receive multicast video stream from multicast servers. This 4 Ports
11g Wireless ADSL2/2+ Router support an IGMP (Internet Group Management Protocol) proxy that handles
IGMP messages. When enabled, the router will act as a proxy for a PC making requests to join and leave
multicast groups.
„ Enable IGMP Multicast: Click to enable IGMP Multicast and then select a connection listed.
„ Apply: Click Apply to complete the setting.
„ Cancel: Click Cancel to ignore all the changes.
„ To complete and save the setting, click Save All after clicking the Apply button.